How properly solve last and 3rd requirement ?

Question about the task

CRUD

Java Core, Level 7, Lesson 10

Under discussion

need hint

CrUD: Create, Update, Delete.

The program runs with one of the following sets of arguments:
-c name sex bd -u id name sex bd -d id -i id

Argument values:
name (String)
sex ("m" or "f")
bd (birth date in the following format: "04 15 1990")
-c (adds a person with the specified arguments to the end of allPeople; displays the id on the screen)
-u (updates the data of the person with the specified id)
-d (performs the logical deletion of the person with the specified id; replaces all of its data with null)
-i (displays information about the person with the specified id: name sex (m/f) bd (format Apr 15 1990))

The id corresponds to the index in the list.
All the people should be stored in allPeople.
Use Locale.ENGLISH as the second argument for SimpleDateFormat.

Example arguments:
-c Washington m "04 15 1990"

Example output for the -i argument:
Washington m Apr 15 1990

Requirements:

The Solution class must contain a public static List<Person> field called allPeople.
The Solution class must have a static block where two people are added to the allPeople list.
When you start the program with the -c argument, the program should add the person with the specified arguments to the end of the allPeople list and display the id (index).
When you run the program with the -u argument, the program must update the data of the person with the specified id in the allPeople list.
When you run the program with the -d argument, the program must perform the logical deletion the person with the specified id in the allPeople list.
When you run the program with the -i argument, the program should display the data about the person with the specified id in accordance with the format given in the task.

package com.codegym.task.task17.task1710; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; /* CRUD */ public class Solution { public static List<Person> allPeople = new ArrayList<>(); static { allPeople.add(Person.createMale("Donald Chump", new Date())); // id=0 allPeople.add(Person.createMale("Larry Gates", new Date())); // id=1 } public static void main(String[] args) throws ParseException { SimpleDateFormat date = new SimpleDateFormat("MM dd yyyy"); Date dd = new Date(); if(args[0].equals("-c")){ if(args[2].equals("f")){ Date date1 = date.parse(args[4]); allPeople.add(Person.createFemale("Maya", date1)); } else { Date date2 = date.parse(args[4]); allPeople.add(Person.createMale("Max", date2)); } System.out.println(allPeople.get(allPeople.size()-1));} if(args[0].equals("-u")){ allPeople.get(Integer.parseInt(args[1])).setName(args[2]); Date date3 = date.parse(args[4]); allPeople.get(Integer.parseInt(args[1])).setBirthDate(date3); if(args[3].equals("f")){ allPeople.get(Integer.parseInt(args[1])).setSex(Sex.FEMALE); } else allPeople.get(Integer.parseInt(args[1])).setSex(Sex.MALE); } if(args[0].equals("-d")){ allPeople.get(Integer.parseInt(args[1])).setName(null); allPeople.get(Integer.parseInt(args[1])).setSex(null); allPeople.get(Integer.parseInt(args[1])).setBirthDate(null); } if(args[0].equals("-i")){ System.out.println(allPeople.get(Integer.parseInt(args[1])).getName() + " " + allPeople.get(Integer .parseInt(args[1])).getSex() + " " + allPeople.get(Integer.parseInt(args[1])).getBirthDate()); } // Start here } }

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Andrew

Level 29 , Seattle, United States

20 March 2019, 19:57

For -c: 1. args[4] is out of the array bounds if args[0] is -c. 2. A new Person is assigned a name instead of using the name found in the args[]. 3. The println doesn't print the index (id). Nice to have but doesn't break code: 1. Duplicated code when you create date1 and date2. You can pull this out and put it in the first if statement. 2. Date dd is not used. For -i: 1. The example arguments gives a clue as to the format it is looking for. Sex is "m" or "f", not MALE/FEMALE. 2. Birthdate is printed with all Date features instead of limited to just the d m y.

Wojtek

Level 23 , Solec-Zdroj

12 March 2019, 15:05

I tried override in the Person class:

public String toString() {
       String a;
          try {
              SimpleDateFormat date = new SimpleDateFormat("MM dd yyyy");
              String str = date.format(getBirthDate());
              Date dd = date.parse(str);
              if (sex.equals(Sex.MALE)) {
                  a = getName() + " m " + dd;
              } else
                  a = getName() + " f " + dd;
          }
          catch (Exception e){

          }
          return a;

   }

but it can't be solve in this way because we don't get properly String a.

Andrew

Level 29 , Seattle, United States

20 March 2019, 20:00

You shouldn't need to mess with the Person class. Try putting some of the date formatting code in with your -i code.